1986 Nissan Sentra mileage: 98,000. When I woke up this morning and started my car, I noticed it was idling very high. There is also smoke coming out of the tail pipe. I turned the car off and checked my oil. It was low but uses oil fast for some unknown reason. I put a quart of oil in and tried to start it but it made a loud noise in the engine. I turned the ignition back to off then waited a minute, and it started, but it was still idling high. I put it in gear to move it to the driveway and the engine went down to normal as I moved, but increased again, when I stopped. I heard it could possibly be something with not having enough anti-freeze, but it did not freeze last night. Any help is appreciated.